Sparking plug for internal-combustion engines



July 27,1926 1,593,770

A. FANG SPARKING PLUG FOR INTERNAL COMBUSTION ENGINES Filed July 176 1924 Patented July 27', 1926.

UNITED STATES ANTO N LANG, OF DUSSELDORF, GERMANY.

SPARRING PLUG FOR INTERNAL-COMBUSTION ENGINES.

I Application filed July 16, 1-924, Serial No. 726,297, and in Germany May 24, 1924.

This invention relates to, a sparking-plug for internal-combustion engines and of the kind provided with a hollow inner electrode adapted to be used for the introduction of starting-fuel or for circulating air or gases for cleaning purposes across the sparking-points.

The object of the invention is essentially to improve the plug with a view to obtain a more reliable starting-action, and the invention consists in this respect in forming the sparking-points of the inner electrode on the edge of a dished plate adapted to retain introduced fuel and to maintain the space above thesparking-points for some time charged with vapour, thereby ensuring almost certain ignition.

Means are also provided whereby the spacing of the sparking-elements may be easily regulated and whereby the electric conductor can be applied to the sparking 'plug in the lnost eflicient manner. 7

Fig. 1 of the accompanying drawings represents a longitudinal section of the sparking-plug, and

Fig. 2, an elevation of the sparking-elements.

The inner electrode a of the sparking plug has a-central bore 7) which is carried from the outer end of the electrode body almost to the inner end h of the same.

I Here theelectrode .body is reduced to receive a dished plate f on the up-turned edge ofwvhich the sparking-points k are formed. A washer g is also applied to the reduced portion h which is upset to hold the washer and the plate 7 securely in position. Lateral slots Z are made in the electrode just above,the plate- 7 so that fuel introduced into the bore b for facilitating'the starting of the engine, will be discharged into the I plate andpartl retained in -1ts cavity i,

the sparking-points is being left dry above the liquid. A shoulder a on the electrode body a supports, by means of a packing r, in

faces. The slotted portion of the body a and a distance a above this portion is spaced from the casing 0 so as to form a chamber '21 into which the liquid retained in the plate 7 can evaporate and form a fresh and easily ignitible mixture in the immediate neighborhood of the sparking-points. The sparking-points y of the outer electrode are formed on a ring m which is held in the lower end of the casing 0 either frictionally or by a screw-thread so that it can be adjustcd for regulating the distance between the points 3/ and 70. An inturned flange w at the orifice of the casing o prevents the ring m from being entirely withdrawn. The sparking-points are separated by V-shaped notches. They are Wide'and chisel-shaped so that long edges m are formed along which the actual sparking-points n will be continually renewed by wear.' The plate f and the ring as are of equal diameter and formed withan equal number of points so that a ring of parallel spark brushes is produced'around the cavity 11. The ring and the plate act together as a condenser and produce very powerful sparks. The sparking points are, owing to their position, effectively protected from splashes of oil and soot. r

A sleeve .2 is formed with an internal screw-thread 8 whereby it is screwed on the 'the two a ring 5-isarranged so as to be clamped in position. The ring 5 has a circumferential groove .6 in which another ring 7 is rotatively guided; The latter ring carries a radially arranged, screw-threaded stud 9 which is fitted with a nut 10 and serves as aterminal screw for the electric conductor. As this terminal can be turned about the plug into any suitable position, it is possible to connect up the conductor without bending and twisting the same. The sleeve a has also a screw-thread 12 for the reception of a ,valve plug 11 whereby the bore 12 is normallyclosed to the atmosphere. The plug 11 has a duct which opens nto the sleeve "2 above the valve seat so as to be outof communication with the bore 6 when the valve is closed and'which can be used, when the valve is' open, for introducing starting fuelinto the engine cylinder through the sparking-plug. The duct 0f the plug 11 is widened out at 13 to form the latter, an outer electrode, an

a funnel. The ralve plug is adjusted by means ofva head 14 of insulating material.

I claim 1. A sparking plug of the character described comprising a'hollow inner electrode,

a dished plate connected to the lower end 2. A sparking plug according to claim 1 in which the ring depending from the outer electrode is held in the latter so that it can beadjusted for re ulating the distance between the two sets 0% sparking points.

3. A sparking plug according to claim 1 in which the sparklng points are chiselshaped and the notches between them V-- shaped.

4. In a sparking plug according to claim 1, a ring guided rotatabl about the upper end of the inner electrode, and a terminal screw connected to said ring so that it can be turned by means of the latter to different angular positions about the plug.

- ANTON LANG. 

